How far can a 2×6 Rafter cantilever?

Deck Joist Cantilever Rules and Limits

Joist Spacing (o.c.) 16″
Douglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir 2×6 1′-0″
2×8 1′-10″
2×10 3′-2″
2×12 3′-11″

What is a cantilever roof?





A structural member or assembly that is unsupported on one side or one end is said to be a “cantilever.” The cantilevered parts of the roof are its least stable parts, whether the roof is of truss construction or of the more traditional methods using rafters.

What are cantilevered eaves?

A cantilevered roof is commonly used over a ‘stepped in’ building entry, or to provide an larger overhang while keeping the same eaves height.

What is the overhang on the roof?

The roof overhang refers to how much the edge of the roof goes beyond the house siding. Under the overhang is a structure known as the soffit. Most homes have an overhang, however, length varies greatly depending on the architectural style of the roof, with slate roofs having longer overhangs typically.

What is the maximum cantilever length?

What is the maximum span of cantilever beams? Usually, for small cantilever beams, the span is restricted to 2 m to 3 m. But the span can be increased either by increasing the depth or using a steel or pre-stressed structural unit.

How much overhang can a roof have without support?





Two feet is the general maximum length for a typical roof overhang. This will protect a roof from most types of damage. Roof overhangs can extend farther than 2 feet, but beyond this length, they begin to lose structural integrity and require external support.

What is the purpose of a cantilever?

Cantilevers provide a clear space underneath the beam without any supporting columns or bracing. Cantilevers became a popular structural form with the introduction of steel and reinforced concrete. They are used extensively in building construction, notably in: Cantilever bridges.

How many types of cantilever are there?

In a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms which extend away from the obstacle.

What are the basic parts of a cantilever?

A cantilever bridge consists of three parts: the outer beams, the cantilevers, and the central beam. Each of the outer beams of the bridge is somewhat similar to a short beam bridge. The on-shore edge of the bridge is attached to the ground itself or to a pier that is sunk into the ground.

What is an exterior overhang called?



A roof overhang that extends past the home’s exterior wall is also called an eave. It’s the structure at the end of the roof’s slope. Another name for a roof overhang is the rafters of your roof.

What is an advantage of having an overhanging roof?

Roof overhangs have several important functions: they can protect exterior doors, windows, and siding from rain; they can shade windows when solar heat gain is undesirable; and they can help keep basements and crawl spaces dry.

Does a roof need an overhang?

Roof overhangs have several important functions: they can protect exterior doors, windows, and siding from rain; they can shade windows when solar heat gain is undesirable; and they can help keep basements and crawl spaces dry.

What is the minimum overhang for a roof?



There is no true standard size for overhangs, but typical overhangs that are used for protection from rainfall are 16-18 inches wide. Overhangs wanted for shading should be minimally 24 inches.

Can I extend my roof overhang?

To extend the overhang of your roof, you will need to provide plenty of underlying support. This means extending your rafters. Be sure to cut your rafter tail extensions about three times the length of the final overhang that you plan to add.

How wide should a roof overhang be?

Overhangs can vary from a few inches to a few feet depending on preference; however, the suggested width of an overhang is between 12” and 18” for eaves and no more than 8” for rakes. That said, overhangs can extend as far as 2′ without the need for external supports.

How is overhang length calculated?

In most climate conditions the following formula can be used to determine the appropriate amount of overhang: X=1/2Y (where X is the length of the overhang required and Y is the distance from the bottom of the door to the base of the overhang.)

How big should gable overhang be?



The Federal Emergency Management Agency (FEMA) recommends a maximum of 8 inches of gable roof overhang and a maximum of 4 inches on center fastener spacing for ladder framing in high wind regions.

How much overhang should a porch roof have?

Typically, a porch overhang should be at least 12-inches long. However, they can range from two feet to very minimal in length depending on the area’s climate, so be sure to account for the amount of rainfall you might expect. Drier climates require minimal overhang length and wetter climates require longer overhangs.

Does porch overhang need support?

If you live in a wet climate, porch roofs require at least 12-inches of overhang to shed water properly. However, try to remember that porch overhangs can be built too long. It is not recommended to extend an overhang by more than two feet, or external supports will be required.

What is overhang length?

This is the distance that the overhang (or roof eaves) extend from the wall. Measure along the overhang from the outermost tip of the overhang to the wall. You can use any units for the overhang length—feet, inches, meters, cm, furlongs, etc. —as long as you use the same units for all window and overhang measurements.